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Publication numberUS5458718 A
Publication typeGrant
Application numberUS 08/210,892
Publication date17 Oct 1995
Filing date18 Mar 1994
Priority date19 Mar 1993
Fee statusLapsed
Also published asDE69311090D1, DE69311090T2, EP0615833A1, EP0615833B1
Publication number08210892, 210892, US 5458718 A, US 5458718A, US-A-5458718, US5458718 A, US5458718A
InventorsRamchandra Venkitachalam
Original AssigneeVip Industries Limited
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Heat sealing method for making a luggage case
US 5458718 A
Abstract
A method of joining a beading to a luggage case is provided in which the beading has a conductive material, for example a length of wire embedded within it and in which the beading and the luggage case are positioned together and the conductive material made to pass a current so that it heats up causing the thermoplastic materials to melt locally and fuse. A hard shell luggage case having a thus joined beading and which in a particular embodiment includes a lining which also becomes attached to the case in the method is also provided.
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Claims(7)
What is claimed is:
1. A method of attaching a beading to a luggage case shell which comprises:
positioning a thermoplastic beading around the periphery of the said luggage case shell, the periphery of the luggage case shell being thermoplastic and a length of conductive material being embedded in one of said beading and said luggage case shell; and
passing a current through the conductive material whereby the material of the thermoplastic beading and luggage case shell melt and fuse locally, to attach the beading to the luggage case shell.
2. A method according to claim 1 which further comprises a first step of extruding a length of said beading together with a length of said conductive material whereby the conductive material is embedded in the beading.
3. A method according to claim 2 wherein the conductive material is a wire.
4. A method according to claim 1 which further includes trapping the edge of a lining between the beading and hard shell, whereby when a current is passed through the wire, the edge of the lining also melts and fuses with the beading and/or shell.
5. A method according to claim 4 which further comprises fixing the remainder of the lining to the inside of the hard shell.
6. The method of claim 1 wherein said luggage case shell forms a periphery, said periphery defining a groove extending around said periphery, said orienting step including attaching said beading in said groove.
7. The method of claim 6 wherein said periphery includes an outwardly projecting rim, said groove being defined in said rim.
Description
FIELD OF THE INVENTION

The present invention relates to a heat sealing process. In particular it relates to a heat sealing method of joining a thermoplastic beading, to a luggage case (e.g. a suitcase, briefcase), and also relates to the piece of luggage so formed.

BACKGROUND OF THE INVENTION

In a prior art heat sealing process as shown in U.S. Pat. No. 4,376,005, also known as the EMAWELD process, a thermoplastic matrix loaded with ferromagnetic powder is extruded as a strip and placed between two other plastics surfaces to be fused. The extruded strip is heated by exposing it to a high frequency alternating current and the adjacent plastics surfaces are thus also heated to a temperature at which they fuse with the EMAWELD strip, or with each other. There are disadvantages associated with this method. For example, it is difficult to extrude the plastics when it is loaded with ferromagnetic material, and the whole process is expensive to perform.

It is also known in prior art documents, for example, DE 1,284,618, GB 1,148,044, U.S. Pat. Nos. 5,107,098, 3,047,703 and FR 2,156,472 that a conductive wire can be used in a plastics part so as to fuse the part to a second plastics part by resistance heating. Such a method is used to fuse and seal, e.g. plastics tubes or pipes, motor vehicle fittings, plastics containers or plastics articles.

In certain applications, it would be extremely desirable to be able to seal a plastic strip to another thermoplastics material cheaply and easily. One such application is that of sealing a plastic beading to the hard shell of a suitcase. The plastic beading acts as a water-tight seal to prevent water seeping into the suitcase or as a cushion when the suitcase is closed and the two shells come together. The beading also helps to prevent dust and dirt entering the suitcase.

In more detail, so-called hard side luggage which is typically made of polypropylene or polyethylene often has a plastic beading fitted into grooves around the periphery of the upper and lower shells that make up the suitcase. The plastic beading is made of a soft plastics material, for example, polypropylene, low density polyethylene or ethylvinyl acetate, so that it acts as a cushion. The beading may also be coloured for a pleasing aesthetic effect. Until now, this beading has been attached to the suitcase using adhesives, screws or rivets. This method of fixing is time consuming, labour intensive and therefore expensive. The use of adhesives can give a messy result and screws and rivets tend to look untidy in the finished article. In addition, screws and rivets may cause damage to clothes and can cause injury to the user. They may also become detached from the beading and will then need replacing.

Moulded or hard-side luggage does not usually have an inner lining of cloth or other fabric because there are no frames to conceal the edges of the lining. If a lining is required, a frame will need to be attached for this purpose, with screws or rivets. Again this gives an untidy appearance, and the method of attachment is time-consuming.

SUMMARY OF THE INVENTION

The present invention seeks to provide a method for joining thermoplastics and which can in an exemplary embodiment be used to attach beading to suitcases. The method can also be utilised to attach a lining to a hard shell article of luggage.

in a first aspect the invention provides a method of joining at least two thermoplastic materials wherein at least one of the materials has a conductive material embedded within it which method comprises suitably orienting the thermoplastics materials, and applying a current to the conductive material, whereby localised resistance heating causes the thermoplastic materials to melt locally and to at least partially fuse to join the thermoplastic materials. Preferably the materials become fused when they are cooled, to form a bond.

Preferably the conductive material is wholly embedded in the thermoplastic material, although it may be embedded near to the surface of the thermoplastic material. Preferably the conductive wire is embedded just below the surface, for example, at a distance of around 0.05 mm from the surface. Alternatively, part of the conductive material may be exposed to the exterior of the surface. Preferably the conductive material is embedded near to or exposed at the surface of the thermoplastic material which is intended to be joined to another thermoplastic material.

Preferably the method comprises a first step of extruding a length of a first thermoplastics material together with a length of a conductive material whereby the conductive material is embedded in the thermoplastics material. Typically, the conductive material is a wire, for example a metal wire, and a length of thermoplastics material in the form of a beading may be extruded together with the conductive wire to embed the wire therein. The beading may be L-shaped and the arms of the "L" may be of equal or unequal thickness.

In a specific embodiment the method comprises inserting the beading of thermoplastic material with the embedded length of conductive material into a channel in a hard shell of an article of luggage, and passing a current through the length of conductive material whereby the plastics material of the beading and luggage case shell locally melt and fuse, thereby to attach the beading to the luggage case shell.

Typically, the channel will be a groove in an outwardly projecting rib extending around the periphery of one or both of the hard shells of the article of luggage.

Advantageously the method further includes trapping the edge of a lining between the beading and hard shell, whereby when a current is passed through the conductive material, the edge of the lining also melts and fuses with the beading and/or shell. The remainder of the lining may be fixed, for example by an adhesive, with rivets or screws, or other conventional means, to the inside surface of the hard shell. The lining may be a sheet or woven fabric.

Preferably the trapping of the edge of the lining is carried out by trapping the edge of the lining between a second beading and a second channel of the hard shell. Usually, this second channel will be a second groove in the outwardly projecting rib which extends around the periphery of the hard shell. The second groove will usually be the inner groove, so that the first groove contains the beading which acts as a seal, and the second, inner groove contains the beading which attaches, by trapping, the shell lining.

In a further aspect, the invention provides a hard side luggage case which comprises at least two hard shells, at least one shell having around its periphery which in the closed luggage case abuts the other hard shell a plastic beading, part of which is fused with the periphery of the shell to attach it to the shell.

Preferably the plastic beading sits in and is fused to a channel in a rib which projects outwardly from and extends peripherally around the hard shell of the luggage case. More preferably, the channel is a groove in the rib.

One or both of the hard shells of the luggage case may also have a lining. The edge of the lining may be trapped between and fused to one or both of the beading and the hard shell, to fix the lining to the shell.

Advantageously the remainder of the lining may be fixed, for example by an adhesive, with rivets or screws, or other conventional means, to the inside surface of the hard shell. The advantages of attaching the lining using this heat sealing method are that it gives a neat finish, and edge peeling is avoided.

Typically the hard shell will be formed of polypropylene or polyethylene and the plastic beading will be polypropylene, low density polyethylene, ethylvinyl acetate or some other suitable material. Such a material may be selected for its compatibility in fusing with the material of the shell.

Typically the plastic beading sits in a groove provided in a hard plastic rib which projects outwardly from the periphery of one or both of the shells. The luggage case provided by the present invention may have a beading or lining attached according to any of the methods mentioned above.

BRIEF DESCRIPTION OF THE DRAWINGS

A specific embodiment of the invention will now be described, by way of example only, and with reference to the accompanying drawings in which,

FIG. 1 is a perspective view of a luggage case, in this case a suitcase, exemplifying one aspect of the invention, and showing one part of a side wall in section;

FIG. 2 is a view from above of the suitcase;

FIG. 3 is a view from below of the suitcase;

FIG. 4 is a view of a plastic beading with a wire embedded in it;

FIG. 5 is a view of the plastic beading of FIG. 4 from an opposing side;

FIG. 6 is a section through part of the suitcase at the point where the upper and lower shells meet when the suitcase is closed;

FIG. 7 is a perspective view of the base shell of the suitcase;

FIG. 8 shows the shell of the suitcase mounted on a machine tool for carrying out a method according to the invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

In FIG. 1 a hard side suitcase is indicated generally at 2 and which has two shells 4 and 6. A plastic beading 8 is fixed in a channel 10 around the periphery of an outwardly projecting rib 17 the upper shell 4. The other plastic beadings 12 and 14 are fixed in respective channels 16 and 18 in ribs 17 and 19 (see FIG. 6) projecting from the upper and lower shells respectively. A lining 20 is attached to the shell at the beadings 16 and 18 and glued with adhesive to the inner surfaces of the shells 4 and 6. FIGS. 2 and 3 show how the beading 8 extends around the periphery of the suitcase with one discontinuity at the hinge 22.

As can be seen more clearly in FIGS. 4 and 5, the beading comprises a length 26 of low density polyethylene with a conductive wire 28 embedded in it. The metal wire is typically of mild steel which may have a resistivity of around 4010-6 Ωcm-1. During manufacture, the beading is extruded together with the conductive wire. The beading 8 can be extruded in any chosen shape to fit with the intended groove. In FIGS. 4 and 5 the pre-melted beading can be seen with the conductive metal wire 28 embedded at 0.05 mm from the surface of the beading.

In FIG. 6 which is a section through the wall of the suitcase after the beadings 8,12 and 14 have been joined to the shell of the suitcase by resistance heating, reference numeral 28 indicates the area of material of the beading and shell which has melted and fused. The conductive wire (not shown) remains embedded within the fused material.

The three beadings 8, 12 and 14 are each of a shape and configuration to fit the appropriate groove. Generally the beading is L-shaped in cross-section. In beadings 8 and 14 the transverse arm of the L-shape is thicker than the upright arm, but in beading 12 the arms are of generally equal thickness. The conductive wire 28 is located at the surface of one of the arms of the L-shape in the pre-fused beading, in the thinner arm where there is a difference in thickness between the arms.

Beading 8 forms an essentially watertight seal between the upper and lower shells to prevent water seeping into the suitcase. Beadings 12 and 14, as well as providing a cushion for the inner rim of the hard shell attach the edge of lining 20 to the hard shell, as will be described below.

To fix the beading 8 to the shell 4, the shell is placed on an apparatus 32 such as that illustrated in FIG. 8 and the beading with the metal wire embedded is inserted into the channel 10. The exposed ends 30 of the metal wire are connected to respective positive and negative electrodes of a power source. When a current is passed through the wire, it heats up due to the resistance to flow of current. The conductive material of the wire can be selected for its resistivity. A typical resistivity of a mild steel wire useful in the invention is 4010-6 Ωcm-1. The heat generated causes the thermoplastic material of the beading and of the shell to melt locally and when the material is then allowed to cool the two materials become partly fused. In this way the beading 8 is effectively heat sealed to the shell and a band is formed. The exposed ends of the wire can be cut away close to the rib.

A similar method is used to attach the beadings 12 and 14 to their respective shells, and to attach the edge of the lining. At least the edge of the material of the lining has thermoplastic properties. In the attachment method, the edge of the lining is trapped between the beading 12 or 14 and the shell 4 or 6 when the beading is inserted into the groove 16 or 18. Again the exposed ends 30 of the wire 28 are connected to the power supply and a current passed to heat the wire. This time, as well as the beading and shell (specifically the rib 34) the edge of the lining is heated so that it partially melts and fuses with the plastic of the shell and beading on cooling. Again the exposed ends of the wire can be cut away. In this way the edges of the lining are concealed underneath the beading, and a tidy and aesthetically pleasing appearance results. The fused bond is long-lasting and this method of attaching the lining is easier and cheaper than fixing with screws or rivets. The size of the sheet which forms the lining 20 can be exactly determined so that once the edges have been attached to the shell the remainder of the lining has a very close fit with the shell. The remainder of the lining can be attached to the shell either before or after the edges are fixed, and this may be done using any conventional means such as adhesives, screws or rivets.

Referring to FIGS. 1, 2 and 3 an article of luggage according to the present invention is shown which has a carrying handle 38, locks 24, castor wheels 40. The two shells 4 and 6 are hinged together by hinge 22. A pulling handle 36 is hinged to the shell 6 so that it can extend from the shell in use and can lie flat against the shell at other times.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2758682 *16 Sep 195414 Aug 1956Shwayder Bros IncLuggage moldings
US2969891 *12 Mar 195831 Jan 1961Presnick Michael CCase finishing molding
US3047703 *26 Mar 195931 Jul 1962Honeywell Regulator CoSealing apparatus
US3756881 *11 Jan 19714 Sep 1973Denman StMethod of coupling articles of unlike materials
US4376005 *22 Sep 19808 Mar 1983Dayco CorporationMethod of making hose
US4436988 *1 Mar 198213 Mar 1984R & G Sloane Mfg. Co., Inc.Spiral bifilar welding sleeve
US4993585 *26 Jul 199019 Feb 1991Mcmahon WilliamEncapsulated case edging
US5107098 *4 Jun 199021 Apr 1992Boulet D'auria Terlizzi And Gaz De FranceProfiled sheathed wire for forming into an electric resistance welding insert
US5111920 *8 Oct 198612 May 1992Samsonite CorporationLuggage case with recessed latches
DE1284618B *13 Feb 19655 Dec 1968Ruhrchemie AgVerfahren zum Verstaerken von durch Aufboerdeln von Rohren aus hochmolekularem Polyaethylen gebildeten Flanschen
EP0019497A1 *10 Apr 198026 Nov 1980Philippe LhotellierMethod for the tight fastening of a rigid frame to the rim of a shell and closed containers
EP0221215A1 *31 Oct 198513 May 1987SAMSONITE CORPORATION (a Delaware corporation)Luggage case
EP0548750A1 *15 Dec 199230 Jun 1993FIAT AUTO S.p.A.Motor vehicle fuel tank and a process for its construction
FR2156472A1 * Title not available
GB1148044A * Title not available
GB1577650A * Title not available
GB1592055A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6003646 *7 Aug 199721 Dec 1999Patagonia, Inc.Method for manufacturing soft cloth durable luggage
US765730021 Mar 20022 Feb 2010Medtronic Navigation, Inc.Registration of human anatomy integrated for electromagnetic localization
US766062330 Jan 20039 Feb 2010Medtronic Navigation, Inc.Six degree of freedom alignment display for medical procedures
US769797214 Jul 200313 Apr 2010Medtronic Navigation, Inc.Navigation system for cardiac therapies
US775186515 Sep 20046 Jul 2010Medtronic Navigation, Inc.Method and apparatus for surgical navigation
US776303513 Sep 200427 Jul 2010Medtronic Navigation, Inc.Image guided spinal surgery guide, system and method for use thereof
US779703223 Sep 200214 Sep 2010Medtronic Navigation, Inc.Method and system for navigating a catheter probe in the presence of field-influencing objects
US781804425 Mar 200819 Oct 2010Medtronic Navigation, Inc.Method and apparatus for surgical navigation
US78310825 Jun 20069 Nov 2010Medtronic Navigation, Inc.System and method for image based sensor calibration
US783577816 Oct 200316 Nov 2010Medtronic Navigation, Inc.Method and apparatus for surgical navigation of a multiple piece construct for implantation
US783578421 Sep 200516 Nov 2010Medtronic Navigation, Inc.Method and apparatus for positioning a reference frame
US784025330 Sep 200523 Nov 2010Medtronic Navigation, Inc.Method and apparatus for surgical navigation
US785330513 May 200514 Dec 2010Medtronic Navigation, Inc.Trajectory storage apparatus and method for surgical navigation systems
US788177016 Mar 20041 Feb 2011Medtronic Navigation, Inc.Multiple cannula image guided tool for image guided procedures
US792532817 Dec 200712 Apr 2011Medtronic Navigation, Inc.Method and apparatus for performing stereotactic surgery
US795347127 Jul 200931 May 2011Medtronic Navigation, Inc.Method and apparatus for implantation between two vertebral bodies
US797134125 Mar 20085 Jul 2011Medtronic Navigation, Inc.Method of forming an electromagnetic sensing coil in a medical instrument for a surgical navigation system
US797467728 May 20095 Jul 2011Medtronic Navigation, Inc.Method and apparatus for preplanning a surgical procedure
US799606419 Oct 20099 Aug 2011Medtronic Navigation, Inc.System and method for placing and determining an appropriately sized surgical implant
US799806219 Jun 200716 Aug 2011Superdimension, Ltd.Endoscope structures and techniques for navigating to a target in branched structure
US804605224 Mar 201025 Oct 2011Medtronic Navigation, Inc.Navigation system for cardiac therapies
US805740711 Oct 200515 Nov 2011Medtronic Navigation, Inc.Surgical sensor
US80601855 Oct 200915 Nov 2011Medtronic Navigation, Inc.Navigation system for cardiac therapies
US807466231 Jul 200613 Dec 2011Medtronic Navigation, Inc.Surgical communication and power system
US810533921 Jul 201031 Jan 2012Sofamor Danek Holdings, Inc.Image guided spinal surgery guide system and method for use thereof
US811229221 Apr 20067 Feb 2012Medtronic Navigation, Inc.Method and apparatus for optimizing a therapy
US816565826 Sep 200824 Apr 2012Medtronic, Inc.Method and apparatus for positioning a guide relative to a base
US817568116 Dec 20088 May 2012Medtronic Navigation Inc.Combination of electromagnetic and electropotential localization
US820031422 Jan 200712 Jun 2012British Telecommunications Public Limited CompanySurgical navigation
US823900111 Jul 20057 Aug 2012Medtronic Navigation, Inc.Method and apparatus for surgical navigation
US82710691 Jul 201018 Sep 2012Medtronic Navigation, Inc.Method and apparatus for surgical navigation
US829057213 Sep 201016 Oct 2012Medtronic Navigation, Inc.Method and system for navigating a catheter probe in the presence of field-influencing objects
US83206538 Nov 201027 Nov 2012Medtronic Navigation, Inc.System and method for image based sensor calibration
US83597301 Jul 201129 Jan 2013Medtronic Navigation, Inc.Method of forming an electromagnetic sensing coil in a medical instrument
US840161623 Sep 201119 Mar 2013Medtronic Navigation, Inc.Navigation system for cardiac therapies
US84520682 Nov 201128 May 2013Covidien LpHybrid registration method
US84675892 Nov 201118 Jun 2013Covidien LpHybrid registration method
US846785115 Nov 201018 Jun 2013Medtronic Navigation, Inc.Method and apparatus for positioning a reference frame
US846785314 Nov 201118 Jun 2013Medtronic Navigation, Inc.Navigation system for cardiac therapies
US84730322 Jun 200925 Jun 2013Superdimension, Ltd.Feature-based registration method
US849461327 Jul 201023 Jul 2013Medtronic, Inc.Combination localization system
US849461427 Jul 201023 Jul 2013Regents Of The University Of MinnesotaCombination localization system
US85485651 Feb 20101 Oct 2013Medtronic Navigation, Inc.Registration of human anatomy integrated for electromagnetic localization
US85497321 Jul 20118 Oct 2013Medtronic Navigation, Inc.Method of forming an electromagnetic sensing coil in a medical instrument
US86119846 Apr 201017 Dec 2013Covidien LpLocatable catheter
US863489713 Dec 201021 Jan 2014Medtronic Navigation, Inc.Trajectory storage apparatus and method for surgical navigation systems
US864490729 Apr 20104 Feb 2014Medtronic Navigaton, Inc.Method and apparatus for surgical navigation
US86606358 Mar 200725 Feb 2014Medtronic, Inc.Method and apparatus for optimizing a computer assisted surgical procedure
US86630882 Dec 20094 Mar 2014Covidien LpSystem of accessories for use with bronchoscopes
US86965489 Jun 201115 Apr 2014Covidien LpEndoscope structures and techniques for navigating to a target in branched structure
US869668512 Mar 201015 Apr 2014Covidien LpEndoscope structures and techniques for navigating to a target in branched structure
US870618515 Nov 201022 Apr 2014Medtronic Navigation, Inc.Method and apparatus for surgical navigation of a multiple piece construct for implantation
US87316417 May 201220 May 2014Medtronic Navigation, Inc.Combination of electromagnetic and electropotential localization
US876472514 Nov 20081 Jul 2014Covidien LpDirectional anchoring mechanism, method and applications thereof
US876843725 Oct 20061 Jul 2014Sofamor Danek Holdings, Inc.Fluoroscopic image guided surgery system with intraoperative registration
US883819914 Feb 200516 Sep 2014Medtronic Navigation, Inc.Method and apparatus for virtual digital subtraction angiography
US884565516 Aug 201030 Sep 2014Medtronic Navigation, Inc.Instrument guide system
US890592019 Sep 20089 Dec 2014Covidien LpBronchoscope adapter and method
US893220710 Jul 200913 Jan 2015Covidien LpIntegrated multi-functional endoscopic tool
US90558811 May 200516 Jun 2015Super Dimension Ltd.System and method for image-based alignment of an endoscope
US908926114 Sep 200428 Jul 2015Covidien LpSystem of accessories for use with bronchoscopes
US911381317 Dec 201325 Aug 2015Covidien LpLocatable catheter
US911725820 May 201325 Aug 2015Covidien LpFeature-based registration method
US916810218 Jan 200627 Oct 2015Medtronic Navigation, Inc.Method and apparatus for providing a container to a sterile environment
US92718032 May 20131 Mar 2016Covidien LpHybrid registration method
US95045303 Feb 201429 Nov 2016Medtronic Navigation, Inc.Method and apparatus for surgical navigation
US95751402 Apr 200921 Feb 2017Covidien LpMagnetic interference detection system and method
US959715424 Feb 201421 Mar 2017Medtronic, Inc.Method and apparatus for optimizing a computer assisted surgical procedure
US964251411 Apr 20149 May 2017Covidien LpEndoscope structures and techniques for navigating to a target in a branched structure
US965937424 Jul 201523 May 2017Covidien LpFeature-based registration method
US96686398 Jun 20126 Jun 2017Covidien LpBronchoscope adapter and method
US967542422 Jul 200913 Jun 2017Surgical Navigation Technologies, Inc.Method for calibrating a navigation system
US975708729 Jun 200912 Sep 2017Medtronic Navigation, Inc.Method and apparatus for perspective inversion
USRE4219412 Jun 20061 Mar 2011Medtronic Navigation, Inc.Percutaneous registration apparatus and method for use in computer-assisted surgical navigation
USRE4222612 Jun 200615 Mar 2011Medtronic Navigation, Inc.Percutaneous registration apparatus and method for use in computer-assisted surgical navigation
USRE4375013 Jul 200916 Oct 2012Medtronic Navigation, Inc.Method for navigating a catheter probe
USRE439525 Oct 199029 Jan 2013Medtronic Navigation, Inc.Interactive system for local intervention inside a non-homogeneous structure
USRE4430528 Feb 201118 Jun 2013Medtronic Navigation, Inc.Percutaneous registration apparatus and method for use in computer-assisted surgical navigation
Classifications
U.S. Classification156/273.9, 156/309.6, 190/100, 156/379.7
International ClassificationB29C65/34, A45C5/02
Cooperative ClassificationB29C66/12445, B29C66/12469, B29C66/612, B29C65/348, B29C65/3464, B29L2031/7418, B29C65/342, A45C5/02, B29C66/5344
European ClassificationB29C66/534, B29C65/34, A45C5/02
Legal Events
DateCodeEventDescription
25 May 1994ASAssignment
Owner name: VIP INDUSTRIES LIMITED, INDIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VENKZTACHALAM, RACHANDRA;REEL/FRAME:006998/0479
Effective date: 19940326
31 Mar 1999FPAYFee payment
Year of fee payment: 4
7 May 2003REMIMaintenance fee reminder mailed
17 Oct 2003LAPSLapse for failure to pay maintenance fees
16 Dec 2003FPExpired due to failure to pay maintenance fee
Effective date: 20031017